/Engine/Source/Editor/BlueprintGraph/Classes/K2Node_FormatText.h
Finds an argument pin by name, checking strings in a strict, case sensitive fashion
NULL if the pin was not found, otherwise the found pin.
[UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * FindArgumentPin ( const [FName](API\Runtime\Core\UObject\FName) InPinName ) const